Updated NodeJS dependencies
Client: nodejs
Patch: Mario Emmenlauer

This closes #2024
diff --git a/package.json b/package.json
index c803df5..4928653 100644
--- a/package.json
+++ b/package.json
@@ -53,13 +53,13 @@
     "eslint-config-prettier": "^3.1.0",
     "eslint-plugin-prettier": "^3.0.0",
     "html-validator-cli": "^4.1.4",
-    "istanbul": "^0.4.5",
+    "nyc": "^15.0.0",
     "jsdoc": "^3.6.3",
-    "json-int64": "^1.0.0",
+    "json-int64": "^1.0.2",
     "prettier": "^1.14.3",
     "tape": "^4.9.0",
     "typescript": "^3.1.6",
-    "utf-8-validate": "^4.0.0"
+    "utf-8-validate": "^5.0.0"
   },
   "scripts": {
     "cover": "lib/nodejs/test/testAll.sh COVER",